What was found
AFT CARGO COMPARTMENT R/H FLOOR SHIELD BS.767 TO BS.787+6 RBL.21 UPPER AND LOWER SURFACE HAS AREAS OF CORROSION. GROUNDED - YES. EVALUATED R/H SHIELD STA 767 TO STA 787, ORIGINAL THICKNESS .050 REMOVED .010 REMAINING .040 FOUND TO BE OUT OF LIMITS IAW B737-900ER SRM 53-60-15, REMOVED, LOCATED AND DRILLED, AND INSTALLED NEW SHIELD P/N: 146A8127-12 PO:1130356.1 IAW B737-900 SRM 51-40-02, SRM 51-40-05 AND BOEING DWG: 146A0081, REV A.